title: Incorporation of an allene unit into alpha-pinene: generation of the cyclic allene 2,7,7-trimethylbicyclo[4.1.1]octa-2,3-diene and its dimerization.
mesh_terms: D000466:Alkadienes / Q000138:chemical synthesis / Q000737:chemistry*; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D019281:Dimerization; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D039821:Monoterpenes / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: C483921:2,7,7-trimethylbicyclo(4.1.1)octa-2,3-diene; D000466:Alkadienes; D000081008:Bicyclic Monoterpenes; D001643:Bridged Bicyclo Compounds; D039821:Monoterpenes; C025947:propadiene; C005451:alpha-pinene